[Imprint][Data Privacy Statement][E-Mail]



View long theorem info. View the proof. Back to main index. View the specification. View theorem base summary, View theorem base listing, the used properties by spec, the dependency list, the symbol table,

Proof step 1 from proof square-nle-01-01 (conclusion)

⊦ ¬ ((n + 1) * (n + 2)) / 2 ≤ n

User applied rule insert lemma

And obtained the following new goals

Rule argument

spec: nat-div inst: name: square-nle-01 seq: ⊦ (n * (n + 1)) / 2 ≤ n ↔ n < 2 subst: [n] → [n + 1] flags: current, []

Additional information

Used simplifier rules: two-rec: ⊦ (m + 2) / 2 = m / 2 + 1;%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic2%c: ⊦ m + n = n + m; from specification nat-basic2%rsucc-02: ⊦ m * (n + 1) = m * n + m; from specification nat-mult%mult-a: ⊦ m0 * m * n = (m0 * m) * n; from specification nat-mult%mult-c: ⊦ m * n = n * m; from specification nat-mult%lep-02: ⊦ m + n ≤ m + n0 ↔ n ≤ n0; from specification nat%l-num-05: n < n0 ⊦ m + (* n) < (* n0) ↔ m < n0 - n; from specification nat%one-01: ⊦ m < 1 ↔ m = 0; from specification nat-basic1%succ-01: ⊦ m + 1 ≤ n ↔ m < n; from specification nat%lels-03: ⊦ m < n → m ≤ n; from specification nat%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic1%lf-01: ⊦ m < n ∧ n = n0 → m < n0; (forward) from specification nat-basic1 Used terms: n + 1